6.11 Page 7: D/A Output Channel Control

Page 7, Base + 12 Write D/A Output Low Byte

Page 7, Base + 13 Write D/A Output High Byte

These registers are used to write 16-bit data to the D/A. These registers function correctly regardless of whether the installed D/A is 12 bits or 16 bits. If data is written to page 7 base + 13, then the next time base + 5 is written, the FPGA will send the data from page 7 base + 12 & 13 to the channel selected by the channel bits in base + 5. After one such cycle, the FPGA will revert to using base + 4 & 5 for the D/A data until page 7 base + 13 is written to again.

Page 7, Base + 14 Write D/A Output Low Byte

D/A JPOVRD	Selects control of the D/A converter between the hardware jumper settings of signals J_D/A FX/VR, J_D/A GAIN1, J_D/A GAIN0 and J_D/A POL or the register bits D/A FX/VR, D/A GAIN1, D/A GAIN0 and D/A POL here in Register 14. When set to ‘1’ use the contents of this register When set to ‘0’ use the jumpers on board.
D/A FX/VR	Sets the D/A converter reference voltage to variable when ‘0’ or fixed when ‘1’.
D/A GAIN1	Sets the D/A converter output voltage gain. See table below.
D/A GAIN0	Sets the D/A converter output voltage gain. See table below.
D/A POL	Sets the D/A converter polarity to unipolar when ‘0’ or bipolar when ‘1’. See table below.

D/A GAIN1	D/A GAIN0	D/A POL	Description
0	0	0	5V span (0 to +5V unipolar)
0	0	1	5V span (-2.5V to +2.5V, bipolar)
0	1	0	10V span (0 to +10V unipolar)
0	1	1	10V span (-5V to 5V bipolar)
1	0	0	Not Used – Sets output to 0V
1	0	1	20V span (-10V to +10V only)
1	1	0	Not Used – Sets output to 0V
1	1	1	D/A converter shut down

Page 7, Base + 14 Read D/A Hardware Jumper Configuration

J_DAC SZ1 Indicates the D/A converter size as indicated in the table below:

J_DAC SZ1	Description
0	16 bits
1	12 bits

D/A JPOVRD	Indicates status of the control of the D/A converter between the hardware jumper settings of signals J_D/A FX/VR, J_D/A GAIN1, J_D/A GAIN0 and J_D/A POL or the register bits D/A FX/VR, D/A GAIN1, D/A GAIN0 and D/A POL here in Register 14. When set to ‘1’ use the write contents of this register When set to ‘0’ use the jumpers on the board.
D/A FX/VR	Set the D/A converter reference voltage to variable when ‘0’ or fixed when ‘1’.
D/A GAIN1	Indicates the D/A converter output voltage gain setting. See table above.
D/A GAIN0	Indicates the D/A converter output voltage gain setting. See table above.
D/A POL	Indicates the D/A converter polarity is set to unipolar when ‘0’ or bipolar when ‘1’. See table above.